Jōhei

Overview

Jōhei (承平), also romanized as Shōhei, was a Japanese era name (年号, nengō; "year name") that followed Enchō and preceded Tengyō. The era spanned from April 931 through May 938, during the Heian period (794–1185). The reigning emperor throughout this time was Emperor Suzaku (朱雀天皇).

The era began in the fourth month of 931, when the court announced a change of era name. It ended in the fifth month of 938, when the next era, Tengyō, was proclaimed. Emperor Suzaku, who had ascended to the throne in 930, was still a child during much of the Jōhei era, and real political authority rested with his regents and senior court nobles.

What Defined the Era

The Jōhei era is most closely associated with the rebellion of Taira no Masakado (平将門), a provincial warlord from the Kantō region. Masakado's uprising, which began in the latter part of the era, became known as Tengyō no Ran (天慶の乱), named after the following era, but its roots lay firmly in Jōhei. The unrest grew out of violent feuds between rival branches of the Taira clan over land rights and local power in the eastern provinces.

The era also saw the continued dominance of the Fujiwara regency. Fujiwara no Tadahira (藤原忠平) served as regent (摂政, sesshō) and later as chancellor (関白, kanpaku) during this period. His authority shaped court politics, and the imperial government in Kyoto remained largely stable even as provincial order deteriorated in the east.

Another defining feature of the era was the court's response to natural disasters and portents. Era name changes in this period were often triggered by calamities or auspicious signs, and the shift from Enchō to Jōhei followed such reasoning. The court's ritual calendar, with its prayers and offerings, continued to operate as a central mechanism for maintaining cosmic order.

Key Events

In 931, the era name was changed from Enchō to Jōhei, marking the start of the period. The change came shortly after the accession of Emperor Suzaku, whose reign had begun the previous year.

Around 935, Taira no Masakado became embroiled in a dispute with his uncle, Taira no Yoshikane, over an inheritance. The quarrel escalated into armed conflict, and Masakado attacked and killed Yoshikane. This act drew the attention of the central government, but the court's response was slow and ineffective.

By 937, Masakado had expanded his operations, raiding and seizing territory across Hitachi and other eastern provinces. His forces clashed with local governors and rival clans, and the violence spread beyond the original family feud. The court issued orders for his arrest, but provincial authorities proved unable to subdue him.

In 938, the era name was changed to Tengyō. The rebellion continued into the new era, reaching its climax in 939 when Masakado declared himself the "New Emperor" (新皇, shinnō) and established a rival court in Shimōsa Province. He was eventually defeated and killed in 940 by Taira no Sadamori and Fujiwara no Hidesato, but that outcome lay beyond the Jōhei era itself.

The Name in Japanese

The era name is written 承平 in kanji. Its kana reading is じょうへい, and its romaji form is Jōhei, though the alternative reading Shōhei also appears in historical sources.

The name consists of two characters:

• 承 (jō) — meaning "to receive," "to accept," or "to inherit." This character carries the sense of taking on something passed down, such as a mandate, a tradition, or a charge. It appears in words like 承知 (shōchi, "consent" or "acknowledgement") and 継承 (keishō, "succession" or "inheritance").

• 平 (hei) — meaning "peace," "flat," "level," or "calm." This character conveys stability and tranquillity, both in the sense of a peaceful realm and of even, unbroken ground. It appears in words like 平和 (heiwa, "peace") and 平等 (byōdō, "equality").

Together, 承平 can be read as "receiving peace" or "inheriting tranquillity." The name expresses the hope that the new era would bring a peaceful continuation of the imperial order. The choice of characters reflects the standard practice of era naming: selecting auspicious words from classical Chinese texts that promised stability and good fortune for the reign.

How the Era Name Works

A Japanese era name, or nengō (年号), is a system of dating that counts years from the start of an imperial reign or from a deliberate change of era. The system was adopted from China and has been used in Japan since the seventh century. Each era name consists of two kanji characters, and the era itself lasts until the court decides to change it.

Era names were not fixed to a single emperor's lifetime. The court could change the nengō at any time, often in response to natural disasters, epidemics, portents, or other events considered inauspicious. A new era was seen as a way to reset the cosmic balance and start afresh. In practice, some emperors had multiple era names during their reign, while others kept a single name for many years.

The year count begins at the first year of the era, called gannen (元年, "origin year"). Subsequent years are numbered from there: Jōhei 2, Jōhei 3, and so on. The system remained in continuous use until the Meiji period, when the practice was changed so that one era name would last for the entire reign of each emperor. This modern system, still in use today, is known as the gengō (元号) system, and the current era is Reiwa (令和).

During the Heian period, era names were chosen by court scholars who consulted classical Chinese texts for auspicious phrases. The name Jōhei, with its connotations of inherited peace, fit squarely within this tradition. The era name served not only as a dating system but also as a statement of political intent, signalling the court's desire for stability in a time when provincial violence was beginning to challenge central authority.